Oil drain & air purge – MAHLE RTI TC640 User Manual
Page 9
RTI Technologies, Inc.
September 15, 1997
Page 8
Pressure in Bars
0
C
R12
R134
1
3.15
3.01
2
3.28
3.10
3
3.38
3.28
4
3.52
3.45
5
3.66
3.66
6
3.79
3.81
7
3.93
3.97
8
4.07
4.12
9
4.24
4.28
10
4.41
4.41
11
4.57
4.57
12
4.73
4.73
13
4.89
4.89
14
5.05
5.05
15
5.22
5.24
16
5.38
5.42
17
5.54
5.60
18
5.70
5.79
19
5.87
5.97
20
6.07
6.34
21
6.28
6.59
22
6.48
6.83
23
6.69
7.07
24
6.90
7.31
25
7.11
7.56
26
7.31
7.80
27
7.52
8.04
28
7.73
8.28
29
7.94
8.52
30
8.14
8.76
31
8.35
9.04
32
8.55
9.32
33
8.80
9.59
34
9.05
9.87
35
9.30
10.15
36
9.55
10.43
37
9.79
10.71
38
10.04
10.99
39
10.29
11.26
40
10.62
11.52
41
10.83
11.81
42
11.08
12.09
43
11.32
12.42
44
11.60
12.77
45
11.88
13.12
46
12.16
13.47
47
12.44
13.82
48
12.73
14.16
49
13.01
14.51
50
13.29
14.86
Purge Chart
OIL DRAIN & AIR PURGE
Oil and Non-condensable Gas (Air) are
separated from the recovered refrigerant
and MUST be removed following EACH
recycling procedure as follows:
1. PRESS and hold the Purge Button (To the
right of the Purge Chart) for 5 seconds.
2. SLOWLY open the Oil Drain Valve (Bottom
of Long Combo Filter on back of TC640)
to vent Non-condensable Gas and drain
any oil which may have been removed
from the A/C System.
Unless the A/C System had previously
been overfilled, the TC640 will
typically not remove more than a
tablespoon of oil, making replenishment
unnecessary.
Leave the Oil Drain Valve open.
3. Determine the room temperature.
4. Locate the pressure (Bar) corresponding
to this room temperature (
0
C) in the
chart on the top of the TC640. This
chart is reproduced at the right.
If the pressure indicated on the gauge is
greater than that determined from the
chart...
PRESS and hold open the Purge Button
until the gauge pressure equals that
shown in the chart. Any Non-
condensable Gas will be vented
through the Oil Drain Valve.
5. Close the Oil Drain Valve.
6. PRESS and hold the Purge Button for 5
seconds again. This permits any residual
Non-condensable Gas to be recirculated
for reprocessing during the next recycle
procedure.